Pin tool



Oct. 30, 1934. G. F. ROBERTSON PIN TOOL Filed June 27. 1933 INVENTOR ATTORNEY Patented Oct. 30,4 1934 PATENT OFFICE PIN' TOOL George F. Robertson, Appleton, Wis.

V Application June 27, 1933, Serial No. 677,913

Claims.

"This invention relates to a lens surfacing machine, and its general object is to provide a pin tool Vfor the lens body or block that can be retained in its proper pointed condition in any easy "5 and expeditious manner and with very little effort.

` Another object of the invention is to provide a surfacing pin tool for a lens surfacingmachine, that includes a pin of small diameter so that it can be pointed in .a few seconds when necessary,

and is mounted in a holder having means to feed the pinto operative position, with the result betterquality work can be performed in minimum time.

A further object of the invention is to provide "15 a surfacing pin tool of the character set forth, that issimple in construction, easy to apply to `the lens surfacing machine, is inexpensive to manufacture, and extremely efficient in operation and service.

This invention also consists in certain other ,features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawing and specifically pointed out in the appended claims.

vIn describing my invention in detail, reference will be had to the accompanying drawing wherein like characters denote like or corresponding parts throughout the several views, and in which: Figure 1 is a sectional View taken through a surfacing machine with my pin tool applied thereto.

Figure 2 is a sectional view taken approximately on line 2-2 of Figure 1, looking in the direction of the arrows.

Figure 3 is a view of my surfacing pin tool per se.

Figure 4 is a sectional View taken approximately on line 4-4 of Figure 3, looking in the direction of the arrows.

Figure 5 is a detail view of the feeding sleeve.

Figure 6 is a detail View of the lens body or block pin. c

Figure 'I is a fragmentary view of the screw shaft and its head.

Figure 8 isa fragmentary view of the sleeve and its collar.

Figure 9 is a sectional view taken approximately on line 9-9 of Figure 4, looking in the direc- '50 tion of the arrows.

Figure 10 is a view illustrating the difference between the pin now in general use and my pin, and shows the amount of material to be ground from each in pointing the same.

Referring to the drawing in detail, it will be noted that I have illustrated a conventional type of lens surfacing machine, with my surfacing pin or tool applied thereto, but I want it understood that the tool can be used with any type of machine, without departing from the spirit of the G0 invention.

The surfacing machine as shown includes the usual pin clamping means A, a surfacing lap B, and I have illustrated the lap as having arranged i thereon a lens blank C which` is held on the lap by my pin tool through the instrumentality of the lens block or body D.

It is well known in the art, that the surfacing pins which are generally employed are relatively thick and considerable difficulty is experienced in providing them with the necessary pointed end to be received in the bearing holes of the lens blocks to assure the proper spinning speed for producing perfect work, but that diculty is overcome by my surfacing pin tool which is mounted in the clamping means A in the usual manner.

My tool includes a relatively long tubular body `1 which is tapered at one end as at 2 and secured to its opposite end is a collar 3 which is disposed flush `therewith as clearly shown in Figure 4. 8O Mounted for rotation on the body inwardly of the collar 3 is a ring member 4 which is provided with a threaded opening for a purpose which will be presently apparent. y

Closing the last mentioned end of the body 1 is 85 a anged cap 5, the flange of which being in the form of a skirt and likewise is provided with a threaded opening to accommodate a set screw 6 which is received in the threaded opening of the c ring member 4 for securing the cap for rotation 90 on the body.

Secured in and extending centrally from the cap 5 is a threaded stem 7 that likewise extends centrally within the body l and is threadedly secured within a sleeve 8, the latter being mounted for longitudinal movement within the body as clearly shown in Figure 4. The sleeve 8 is provided with a longitudinally disposed slot 9 and mounted in the slot is a stud 10 to prevent rotation H of the sleeve 8 but allows the same to move longi- '100 tudinally as will be apparent and the stud 10 is secured to the body and extends inwardly therein.

Secured in the reduced portion of the body 1 is a guide and bearing member 11 for the pin 12 which is mounted for movement therethrough and is fed accordingly through the instrumentality of the sleeve 8 which is provided with a stop member 13 bridging the same adjacent its lower end for disposal in the path of the pin 10 as clearly shown in Figure 4. The pin frictionally nts within the sleeve 8, and consequently the pin is not only fed outwardly of the member 11, but can be drawn inwardly if desired.

It will be noted that the pin 12 is of relatively small diameter and is of course provided with a pointed end 14, and due to the small diameter, it will be obvious that the pin can be pointed in an easy and expeditious manner With very little effort, but the same cannot be said With respect to the pin now in general use and which for distinction is illustrated by the letter E in Figure 10, Which is included in the drawing for the purpose of comparing the amount of material to be removed in pointing the respective pins. It will bev seen that considerable time will be consumed pointing the pin E, while my pin 12 can b e pointed in a few seconds.

In feeding the pin 12, it will be apparent that the cap 5 is rotated in one direction, and that rotation causes the sleeve 8 to be moved longitudinally in the body 1 for moving the pin accordingly through the instrumentality of the stop member 13. When the pin 12 is practially conf sumed, itcan be easily replaced by a new pin,

merely by inserting the same upwardly through the guide and bearing member 11 until it contacts the stop member 13.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent. I desire it to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended Claims- What I claim is l j Y d. A surfacing pin toolior a lens surfacing machine, comprising a` holder including a tubular body, a cap mounted for rotation onsaid body,

, a, pin mouhtedin .Said body and having@ pointed end, and means for moving said pin longitudirnally in said body and outwardlyL thereof and being Operated through the instrumentality 0i .Said Cap. i

2, A Surfacing pin i001 for a. lens Surfacing ma.- Qhine, Acoinnrisrls a holder adapted to be clamped in Saidmachine' and including a tubular bodyy a Cap mountedfor rotation 0n one. end. Of Said body,

a sleeve mounted for longitudinal movement in said body, a pin carried by said sleeve and movable through the opposite end of said body and means for moving said sleeve and being secured to said cap.

3. A surfacing pin tool for a lens surfacing machine, comprising a holder adapted to be clamped to said machine and including a tubular body having a reduced end, a cap secured to its opposite end and mounted for rotation thereon, a sleeve mounted for longitudinal movement in said body and being threaded, a stem threaded in said sleeve for moving the latter and being secured to said cap, a pin carried by the sleeve and mounted for movement through the reduced end of said body, and said pin having a pointed outer end. i

4. A surfacing pin tool for a lens surfacing machine, comprising a tubular body having a reduced end, a cap secured to and mounted for rotation on its opposite end, a threaded sleeve mounted lfor `longitudinal movement in said body, .a threaded stem secured to saidcap and threaded in saidsleeve for moving the latter upon rotation of said cap,fm eans toprevent rotation of said sleeve, a guide and bearing member disposed in and extending from the reduced end of said body, a pin'havinga pointed end and carried by said sleeve, and said' pin being mounted for movement through the guide and bearing member.

vius

,-5. A surfacing ,pin tool for a/lens surfacing machine, comprising a tubular body having a reduced end, a cap for closing the vopposite end of said body and being secured thereto for rotation thereon, a sleeve mounted for longitudinal movement in said body and having a longitudinally disposed slot arranged therein, means extending inwardly from said body and disposed in said slotftoprevent rotation of said sleeve, means secured to the cap and threaded in said sleeve for moving the'latter, a pin having a pointed end and extending through the reduced end of said body, said pin being frictionally received in said sleeve to be carried thereby, stop means bridging the sleeve andarranged in the path of the pin, and guiding means for said pin.

GEORGE F. ROBERTSON,

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